delaunayn simplex check consistency and performance improvement (bug #60818) * delaunayn.m: Apply consistent volume calculation across all trivial simplex removal code paths. Vectorize 3D simplex removal code path and minimize function calls within >3D loop for performance improvement. Update FIXME note for future performance improvement. Add input type validation checks. Add BISTs for dimensions other than 2D, simplex removal, and input validation. * etc/News.8.md: Describe function improvements under General Improvements.

## Automake fails to process "include %reldir%/module.mk" in the directory
## above.  All of the commands which would normally be in this file were
## manually placed in scripts/module.mk to avoid using the "include" directive.
##
## This is an Automake bug.  Automake has switched to a Perl backend which uses
## the following pattern to detect a path:
##
## my $PATH_PATTERN = '(\w|[+/.-])+';
##
## This pattern only includes alphanumeric, '_', and [+/.-], but not "@".